Hello there, @Barbara Bernier.
I'd be happy to guide you in exporting your data in QuickBooks Online. This can be done in just a few clicks.
You can export different transactions in QuickBooks Online. Just make sure to select the data that you'd like export then save it to your local hard drive. This way, you can import them anytime.
To do that:
If you want to export other transactions, please see this link attached on how to perform the process depending on the information that you need: Learn how to download your data from QuickBooks Online.
For your reference, here are some resources that you can use for more tips about exporting information and importing bank transactions in QBO:
I'll make sure you're all set. You can always get back to me if you need more help with exporting data. Have a nice day!